Charlemagne mid level api

[KyleGoyette]

Adds run.plot_table (and wandb.plot_table) the mid-level api for Charlemagne. Allowing users to create custom plots on wandb Tables.

[coveralls]

Pull Request Test Coverage Report for Build dbe94216-1832-492a-8fb7-f82f62eb04f7

• 13 of 33 (39.39%) changed or added relevant lines in 4 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 61.478%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wandb/viz.py	3	12	25.0%
wandb/sdk/wandb_run.py	6	17	35.29%

Files with Coverage Reduction	New Missed Lines	%
wandb/sdk/wandb_settings.py	2	82.11%

Totals
Change from base Build d3493861-a339-47a6-9cf5-21f1a26a24d2:	-0.05%
Covered Lines:	13152
Relevant Lines:	21393

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💛 - Coveralls